With the technology developing fast, more and more designers begin to concentrate on the digital ways of controlling the shape of architecture. While in the process of practice, designers always find that real situation and the original assumption are out of sync when using digital ways. It's easy to get stuck in specific things and lose sight of the overall aim. In order to solve this problem, we have worked out the integrity of digital construction method with logic optimization model based on designers'thinking.

In the construction of subway tunnel, a connected aisle is often set in the middle section of the upper and lower parts of the tunnel. The connected aisle is set to increase the safety factor of the tunnel, known as the "escape route". Connected aisle construction is after the completion of the main tunnel and it would have impact on the main tunnel and the surrounding environment to a certain extent. Wastewater pumping house is often combined with connected aisle in construction, but the pumping house design is relatively conservative. Construction technology is constrained by space, so it is more likely to cause risks. Therefore, effective measures are crucial to ensure the safety of excavation. In this paper, the first support deformation risk of a connected aisle of Wuhan Metro tunnel is used as an example, which uses backfill backpressure, first support reinforcement methods and acceleration of the floor construction, providing reference of risk control techniques for similar projects.

Railway construction has been developed rapidly. But during the construction of a new subway, the tunnel will inevitably pass through the foundation of buildings. How to control the risk of underpinning construction and protect existing buildings becomes an inevitable challenge. The paper focuses on the management and technology used in Viaduct Pile foundation underpinning, elaborates the design, construction technology and safety monitoring work. The provided valuable experience of bridge pile foundation underpinning construction in complex environments and geological conditions is helpful to security risk management.